ADV 344 Quiz 6 and 7

Which of the following statements is true of model F statistics? A. A larger F statistic indicates that the regression model has more explained variance than error variance. B. Analysis of linear relationships between a dependent variable and multiple independent variables requires that F statistics be smaller than beta coefficients. C. Bivariate regression becomes multiple regression analysis when F statistics are used. D. Standardization using beta coefficient augments the effects of using different scales of measurement. E. An F statistic shows the change in the dependent variable for each unit change in the independent variable.

A larger F statistic indicates that the regression model has more explained variance than error variance.

_____ is a statistical technique that uses information about the relationship between an independent or predictor variable and a dependent variable to make predictions. A. Beta coefficient analysis B. Multiple regression analysis C. Covariation D. Bivariate regression analysis E. Non-parametric hypothesis coefficient

Bivariate regression analysis

Which of the following is true of the mode? A. It is the middle value of a rank-ordered distribution. B. It is the distance between the smallest and largest values in a set of responses. C. It is unaffected by data values being added or deleted. D. It is especially useful as a measure for data that have been somehow grouped into categories. E. It is the arithmetic average of a sample.

It is especially useful as a measure for data that have been somehow grouped into categories.

Which of the following is true of the median? A. It cannot be determined for data that are skewed to either the right or left. B. It is the value that appears in a distribution most often. C. If the number of data observations is even, the median is generally considered to be the average of the first and last values. D. It is especially useful as a measure of central tendency for ordinal data. E. It is the distance between the smallest and largest values in a set of responses.

It is especially useful as a measure of central tendency for ordinal data.

Which of the following statements is true of the range? A. It is the value that appears in a distribution most often. B. It is a measure of central tendency. C. It describes the average distance of distribution values from the mean. D. It is the distance between the smallest and largest values in a set of responses. E. It is the average squared deviation about the mean of a distribution of values.

It is the distance between the smallest and largest values in a set of responses.

Which of the following is an example of an independent sample? A. The time spent by a group of female students in the library is compared to the time spent by them in the cafeteria. B. The average amount spent on fashion magazines per month by a group of teenagers is compared to the average amount spent on sports magazines per month by the same group of teenagers. C. The average number of energy drinks consumed per day by a group of male students is compared to the average number of energy drinks consumed per day by the general population. D. Male students are compared to female students on the average number of hours they study each weekday. E. The average amount spent on purchasing cosmetics by women in their early 30s to the average amount they spend on purchasing fashion accessories.

Male students are compared to female students on the average number of hours they study each weekday.

Which of the following statements is true about the t-test? A. The larger the value of the standard error of the difference between two means, the larger the value of t. B, The t-test cannot be used when the population standard deviation is unknown. C. The t-test cannot be used for interval or ratio data. D. In order to conduct a t-test, the sample size should be larger than 30. E. The t-test provides a mathematical way of determining if the difference between two sample means has occurred by chance.

The t-test provides a mathematical way of determining if the difference between two sample means has occurred by chance.

For interval or ratio data, the mean is appropriate, except when there are extreme values within the interval or ratio data, which are referred to as outliers. True False

True

In a certain town, when the number of automobiles owned went up, the number of service stations for automobiles also went up. This illustrates the concept of _____. A. coalescence B. cogitation C. covariation D. coexistence E. convergence

covariation

A _____ relationship is one between two variables whereby the strength and/or direction of the relationship changes over the range of both variables. A. proportional B. linear C. collinear D. constant E. curvilinear

curvilinear

The Spearman rank order correlation coefficient differs from the Pearson correlation coefficient in that the Spearman rank order correlation: A. assumes that variables have a normally distributed population, whereas the Pearson correlation coefficient assumes that variables have a uniform distribution. B. is used for linear relationships, whereas the Pearson correlation coefficient is used for curvilinear relationships. C. is used when variables have been measured using ordinal scales, whereas the Pearson correlation coefficient is used when variables have been measured using ratio scales. D. is a qualitative measure of the degree of variation, whereas the Pearson correlation coefficient is a quantitative measure of the degree of variation. E. primarily establishes a weak association between variables, whereas the Pearson correlation coefficient establishes a strong association between variables.

is used when variables have been measured using ordinal scales, whereas the Pearson correlation coefficient is used when variables have been measured using ratio scales.

If a researcher is interested in measuring the effect of two independent variables on a dependent variable, he/she should use: A. the Spearman correlation coefficient B. bivariate regression analysis C. multiple regression analysis D. the Pearson correlation coefficient E. simple regression

multiple regression analysis

A researcher is told that the average age of respondents in a survey is 49 years. She is interested in finding out if most respondents are close to 49 years old. The measure that would most accurately answer this question is: A. standard deviation B. mean C. median D. mode E. range

standard deviation

Researchers use analysis of variance to determine the: A. distance between the smallest and largest values in a set of responses. B. average distance of distribution values from the mean. C. value that appears in a distribution most often. D. statistical difference between three or more means. E. average value within a distribution.

statistical difference between three or more means.

The strength of association between two variables is determined by the size of the correlation coefficient. True False

true

With regard to the least squares procedure, any data point that does not fall on the regression line is the result of: A. sum of the squared errors B. nonresidual variance C. specific variance D. multicollinearity E. unexplained variance

unexplained variance